package org.dromara.vmp.gb28181.transmit.event.response.impl;

import gov.nist.javax.sip.ResponseEventExt;
import gov.nist.javax.sip.message.SIPResponse;
import org.dromara.vmp.gb28181.SipLayer;
import org.dromara.vmp.gb28181.bean.Gb28181Sdp;
import org.dromara.vmp.gb28181.transmit.SIPProcessorObserver;
import org.dromara.vmp.gb28181.transmit.SIPSender;
import org.dromara.vmp.gb28181.transmit.cmd.SIPRequestHeaderProvider;
import org.dromara.vmp.gb28181.transmit.event.response.SIPResponseProcessorAbstract;
import org.dromara.vmp.gb28181.utils.SipUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import javax.sdp.SdpParseException;
import javax.sdp.SessionDescription;
import javax.sip.InvalidArgumentException;
import javax.sip.ResponseEvent;
import javax.sip.SipException;
import javax.sip.SipFactory;
import javax.sip.address.SipURI;
import javax.sip.message.Request;
import javax.sip.message.Response;
import java.text.ParseException;


/**
 * @description: 处理INVITE响应
 * @author: panlinlin
 * @date: 2021年11月5日 16：40
 */
@Component
public class InviteResponseProcessor extends SIPResponseProcessorAbstract {

    private final static Logger logger = LoggerFactory.getLogger(InviteResponseProcessor.class);
    private final String method = "INVITE";

    @Autowired
    private SIPProcessorObserver sipProcessorObserver;


    @Autowired
    private SipLayer sipLayer;

    @Autowired
    private SIPSender sipSender;

    @Autowired
    private SIPRequestHeaderProvider headerProvider;


    @Override
    public void afterPropertiesSet() throws Exception {
        // 添加消息处理的订阅
        sipProcessorObserver.addResponseProcessor(method, this);
    }


    /**
     * 处理invite响应
     *
     * @param evt 响应消息
     * @throws ParseException
     */
    @Override
    public void process(ResponseEvent evt) {
        logger.debug("接收到消息：" + evt.getResponse());
        try {
            SIPResponse response = (SIPResponse) evt.getResponse();
            int statusCode = response.getStatusCode();
            // trying不会回复
            if (statusCode == Response.TRYING) {
            }
            // 成功响应
            // 下发ack
            if (statusCode == Response.OK) {
                ResponseEventExt event = (ResponseEventExt) evt;

                String contentString = new String(response.getRawContent());
                Gb28181Sdp gb28181Sdp = SipUtils.parseSDP(contentString);
                SessionDescription sdp = gb28181Sdp.getBaseSdb();
                SipURI requestUri = SipFactory.getInstance().createAddressFactory().createSipURI(sdp.getOrigin().getUsername(), event.getRemoteIpAddress() + ":" + event.getRemotePort());
                Request reqAck = headerProvider.createAckRequest(response.getLocalAddress().getHostAddress(), requestUri, response);

                logger.info("[回复ack] {}-> {}:{} ", sdp.getOrigin().getUsername(), event.getRemoteIpAddress(), event.getRemotePort());
                sipSender.transmitRequest(response.getLocalAddress().getHostAddress(), reqAck);
            }
        } catch (InvalidArgumentException | ParseException | SipException | SdpParseException e) {
            logger.info("[点播回复ACK]，异常：", e);
        }
    }

}
